In his letter to Bishop Hugo of Sion, Notker Labeo justifies using Old High German translations to teach young pupils Latin. He argues that although his pedagogic approach may strike some as unusual, perhaps even outrageous, it is nonetheless practical and aids greatly in reading and understanding. Immediately following the justification, in what almost appears to be an afterthought, Notker provides some guidelines for writing and pronouncing OHG:

According to Notker, all German words except articuli are to be written and pronounced with acute or circumflex accents.

Notker's comments about the use of accents in OHG have fascinated philologists and linguists ever since Jacob Grimm first published the letter in 1835. They represent one of those rare instances of an eyewitness account regarding the linguistic nature of OHG and testify to the care with which Notker intended his mother tongue to be recorded and pronounced.